I had wrist surgery for tendonitis 3 months ago and am still having pain and burning. The surgeon?

... said if the surgery works I would be pain free in 10 days. What could the problem be? I'm still seeing him but his medication is not working. Any suggestions?

Added 19 Aug 2015:

I am 58 years old and have worked in retail for the past 15 years. I worked with the pain in my wrist for a year and a half before seeing a doctor. Since my surgery, I have been out of work because I do alot of heavy lifting and working with all kinds of heavy freight. I was an assistant manager. Will my hand ever be normal to the point of returning to this type of work?